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Results tagged with solid-state-chemistry
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user 5677
Study of chemical species that are in solid phase, either in cases of their properties, or about ways of synthesizing them.
1
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In atomic diffusion in Au/Cu metal contact, where do the atoms come from ? (need melting tem...
Yes, it takes energy to get an atom off a lattice site. However, as an activated process with an energy barrier, Arrhenius' equation shows you that even with that requirement, some number of atoms wil …
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10
votes
Why are p-type solar cells more prone to degradation in space than the n-type ones?
The space radiation environment is a quite complex subject. Generally speaking one needs to be careful about just where in space you are concerned about - near earth orbit (within the Van Allen Belts) …
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11
votes
Accepted
Are all lattices Bravais lattices?
From Ashcroft and Mermin's Solid State Physics:
A fundamental concept in the description of any crystalline solid is that of the Bravais lattice, which specifies the periodic array in which the r …
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5
votes
Accepted
Why is Cubic closed packing called "cubic"?
Start with the hexagonal A-B-A-B structure. It is hexagonal because, choosing one atom in a layer, it is surrounded by 6 equivalent atoms. So, you have a 6-fold symmetry axis, hence the 'hex-'. The f …
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2
votes
How do phase transitions occur in the solid phase?
Phase transitions in solids occur in the same manner as in liquids or gases, through nucleation and growth. Yes, those processes require atomic motion. Yet,atoms diffuse in solids all the time, throug …
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20
votes
Accepted
Why are there only 7 types of unit cells and 14 types of Bravais lattices?
All quotes will be from Solid State Physics by Ashcroft and Mermin.
Bravais Lattice:
A fundamental concept in the description of any crystalline solid is that of the Bravais lattice, which specif …
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3
votes
Accepted
Unit cell of CdCl2
Cubic close packing is another (confusing) name for face-centered cubic. So, to visualize these structures, you start with a hexagonal 2D layer of the chlorine or iodine. Now start stacking those la …
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2
votes
Accepted
What is the length of a unit cell of CuCl assuming that it is fcc?
Well, yes, depending on the detail you want to go into. You can find a representation of the crystal structure of CuCl at, for example, http://www.webelements.com/compounds/copper/copper_chloride.html …
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11
votes
Accepted
Yellow color of NaCl
An F-center (or any color center) is a point defect in the material that generates localized electronic states. When these states are in the band gap, they will result in strong peaks in optical absor …
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6
votes
Stoichiometric defects in silver bromide
Fundamentally, although ionic radii may offer some guidance as to defect formation, the bottom line is that the silver halides have complex bonding energetics that have to be taken into consideration. …
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6
votes
Accepted
What is the lattice structure of manganese?
Ah, good old Mn. This is one of the uglier ones in terms of phases.
$\alpha$-Mn, the room temperature phase, is CBCC (A12 family), fairly unusual. Near 1000K, Mn transitions to $\beta$-Mn, with a sim …
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5
votes
Why is ZnFe2O4 a normal spinel?
The reason stated in the literature is fairly straightforward. However, actually tracking down the original source is harder than it looks.
Going back to Phys. Rev. B22, 115 (1980) one finds in the …
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4
votes
Accepted
Why and how are mullites (and in extension solid solutions) formed and how are their formula...
Being a solid solution is separate from being a crystal. Some alloys occur with one single stoichiometry (plus/minus defects). Many can accommodate a range of compositions.
Lets start easy: The Au-Cu …
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